Your setup looks OK, but the demo example may not work with that setup. I believe the rgb_easy demo uses the MikroBus slot #2 (INT2, etc.). MHC should adjust for the different configuration, but maybe not. I was able to get the demo to work, but then discovered it used the MRF24WN for the WiFi. I tried to change to the WINC1500 and (I believe) it did not work.

After many hours of code reviews, I determined that the only way forward for me was to rewrite the WiFi driver for the WINC1500. I am working on it, but have no schedule when I will have something working.